Change is the essence of life. Be willing to surrender what you are for what you could become.
从n对观测值的样本中获得的相关系数的可能误差是sqrt((1-r²)/(n-2))。
数学不是沿着一条清理干净的高速公路小心翼翼地行进,而是一次进入陌生荒野的旅程,探险者常常会迷路。
Science is the tool with which we unravel the mysteries of life.
我是那种会让你想抽更多烟的人。